Abstract
Intestinal ischemia/reperfusion (I/R) injury is a potentially life-threatening condition that can cause injuries to remote organs at the end stage. The damage caused by intestinal I/R insult induces changes in the barrier functions of the intestine, and the intrinsic mechanism of regeneration is often insufficient to restore barrier functions, as indicated by the high mortality rate of patients experiencing intestinal I/R injury. However, little is known about the mechanisms of intestinal regeneration after I/R injury. Here, we reported that nuclear receptor-related protein 1 (Nurr1), a nuclear orphan receptor, was induced during intestinal regeneration after I/R. Our findings showed that Nurr1 expression was consistent with the expression of Ki-67 and phosphorylated histone H3 (pH 3) in the intestine after I/R injury. Nurr1 knockdown led to G1-phase arrest mediated by p21 (Waf1/Cip1) activation, but Nurr1 overexpression reduced the proportion of IEC-6 cells in G1 phase as a result of p21 inhibition in a p53-independent manner. Using chromatin immunoprecipitation assays, luciferase assays, and mutational analysis, we demonstrated that Nurr1 directly inhibited the transcription of p21. These results define a novel Nurr1/p21 pathway that is involved in intestinal regeneration after I/R injury. These findings provide novel molecular insights into the pathogenesis of intestinal regeneration after I/R and possibly support the development of new potential therapies for intestinal I/R injury.
Key message
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Nurr1 was induced during intestinal regeneration after I/R injury.
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Nurr1 promoted proliferation of intestinal epithelial cells after H/R injury.
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Nurr1 inhibited p21 expression in a p53-independent manner.
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Nurr1 inhibited p21 gene transcription by binding to p21 promoter directly.
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Acknowledgments
This work was supported by grants from the National Natural Science Foundation of China (No. 81372037, No. 81671954) and the Natural Science Foundation of Liaoning Province, China (No. 201102048).
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Zu, G., Yao, J., Ji, A. et al. Nurr1 promotes intestinal regeneration after ischemia/reperfusion injury by inhibiting the expression of p21 (Waf1/Cip1). J Mol Med 95, 83–95 (2017). https://doi.org/10.1007/s00109-016-1464-6
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DOI: https://doi.org/10.1007/s00109-016-1464-6